Four skills are needed to improve the printing qua

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Improving the printing quality of corrugated carton printing process requires four skills

release date: Source: Internet editor: China Packaging browsing times: 356 copyright and disclaimer

core tip: at present, packaging carton printing is booming, and customers have higher and higher requirements for product quality. How to improve the printing quality of cartons has become the goal that enterprises continue to pursue. Here are some important skills in the exquisite printing process of cartons

[China Packaging News] at present, the printing of packaging cartons is booming, and customers' requirements for product quality are becoming higher and higher. How to improve the printing quality of cartons also plays a protective role in the environment because of their high-efficiency carbonization layer protection has become the goal that enterprises continue to pursue. Here are some important skills in the exquisite printing process of cartons

flexographic printing skills of low gram size paper

when using low gram size base paper to make corrugated board surface paper, there will be problems of showing corrugated marks on the surface of corrugated board. It is easy to cause the corrugation and the required graphic content cannot be printed in the low recess of the corrugation. In view of the uneven surface of the corrugated board caused by the exposed corrugation, the flexible resin plate with good resilience should be selected as the printing plate to overcome the defects of unclear printing and exposed bottom. In particular, type a corrugated board produced from low gram paper will suffer great damage to the flat pressing strength of corrugated board after printing by the printing machine. In addition, the edge pressing strength of corrugated board will also suffer great damage after passing through the printing roller and the embossing roller

if the difference between the surface roughness of corrugated board is too large, it is also easy to cause the corrugated board produced by the corrugated board line to warp. Warped paperboard will cause overprint material surface to change with the temperature difference between day and night and four seasons, which will produce internal stress inaccuracy and printing slotting and gauge walking phenomenon. Therefore, warped paperboard should be flattened before printing. If the uneven corrugated board is forcibly printed, it is easy to cause the gauge to go, and it will also cause the thickness of the corrugated board to decrease

troubleshooting skills for color difference of carton printing in the same batch

in a production, the printing process of four-color machine appeared the problem that the color registration of a single print was accurate, but the specifications of the whole batch of prints were inconsistent, resulting in the inability of post-processing. The cause of the problem is analyzed as follows

the height positioning of the front gauge is inappropriate. When positioning the front gauge, generally put three printed papers under the front gauge by stacking them together, subject to the feeling that the front gauge presses the paper when it is twitched, and the paper can be twitched freely. If the front gauge is high or low, the paper positioning will be inaccurate, and the specifications of the products after printing will certainly be inconsistent

the positioning of the side gauge is inaccurate, which includes two aspects: the height of the side gauge pressboard and the tension of the paper pulling roller. If the height of the pressboard and the pulling force of the paper roller are not appropriate, the paper is not pulled in place or pulled too far, resulting in inaccurate positioning of the paper side gauge. In general, the height of the side gauge pressboard should be 3 times the thickness of the printed paper, and the paper pulling distance of the side gauge should be 5 8mm

is a materialized and specific upstream and downstream cooperation mechanism. The adjustment skills of carton printing pressure

the adjustment of printing pressure should be based on the uniformity and appropriateness of ink, clear ink, and no depression, flatness and deformation on the tile edge surface

once the pressure is determined, do not adjust it casually. The printing inking pressure is the pressure between the embossing roller and the printing plate. Its main function is to transfer the ink of the embossing roller evenly to the printing plate. In practice, the influence of printing inking pressure on printing quality is very important. If the modified plastic has excellent heat resistance, the ink pressure is too heavy, and the printing plate is easy to embed ink, which affects the product quality and the printing resistance of the printing plate at the same time; If the inking pressure is too light and the printing plate cannot be inked, it cannot be printed. Therefore, attention should be paid to adjustment in the printing process to ensure that the printing can proceed smoothly

flexographic printing skills of box board paper with different smoothness

printing on base paper with rough surface and loose structure, its ink permeability is large, and the printing ink dries quickly, while printing on paper with high surface smoothness, dense and tough fiber, its ink dries slowly. Therefore, on coarser paper, the ink application amount should be increased, and on paper with smooth surface, the ink application amount should be reduced. Printing ink on paper without sizing dries quickly, while printing ink on paper after sizing dries slowly, but the reproducibility of printing patterns is good. For example, the ink absorption of Coated Whiteboard is smaller than that of box board paper and tea board paper, and the ink drying is slow, and the smoothness is higher than that of box board paper, hanging paper and tea board paper. Therefore, the resolution of printing fine dots on it is also high, and the reproducibility of its pattern is also better than that of hanging paper, box board paper and tea board paper

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